Perhaps you should try some spelling variations:
cua viet » ca viet, cua vat, cua dieu
cam truc » cau truc, nam truc, lam truoc
so sinh » so sanh, so tinh, cho sinh
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
hieu ve » hieu va, hieu van
sinh y » sinh ly
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, me hoi
y tang » ky tang, 6 tang, 7 tang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sinh y tang ((ma hoi) OR (ma hoa)). hieu ve cam truc va hanh vi ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sinh y tang ((ma hoi) OR (ma hoa)). hieu ve cam truc va hanh vi ((cua viet) OR (hoa viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sinh y tang ((ma hoi) OR (ma hoa)). hieu ve cam truc va hanh vi ((cua viet) or (hoa viet))".
• Adding a wildcard symbol may retrieve word variants: so sinh y tang ((ma hoi) OR (ma hoa)). hieu ve cam truc va hanh vi ((cua viet) or (hoa viet))*.